firestone.
Iron pyrite, formerly used for striking fire.
Meaning & usage
Iron pyrite, formerly used for striking fire.
A flint.
A heat-resistant stone that will withstand intense heat of a furnace, used for lining kilns, campfire rings, fireplaces and furnaces; especially, the sandstone at the top of the upper greensand in the south of England.
Where this word comes from
From Middle English firestone, firstan, fyrestane, fyyr stone, from Old English fȳrstān, equivalent to fire + stone.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.